Lectrosonics SMa User Manual download pdf (Page 4)

SMa Series

General Technical Description

Wideband Design

Digital Hybrid transmitters use ±75 kHz wide deviation

for an excellent signal to noise ratio and wide dynamic

range. The DSP controlled input limiter features a wide

range dual envelope design which cleanly limits input

signal peaks over 30 dB above full modulation. Switching

power supplies to provide constant voltages to the trans-

mitter circuits from the beginning (1.5 Volts) to the end

(0.85 Volts) of battery life, and an ultra low noise input

ampliﬁer for quiet operation.

Servo Input

The SM input is a radically different input system com-

pared to previous Lectrosonics transmitter microphone

inputs. It is so superior that this input system will eventu-

ally be utilized by all Lectrosonics UHF transmitters. The

improvements are audible and make the transmitters

easier to use and much harder to overload. It is no

longer necessary on some mics to introduce pads to

prevent overload of the input stage, divide the bias

voltage down for some low voltage mics, or reduce the

limiter range at minimum gain settings.

Digital Hybrid Wireless™ Technology*

All wireless links suffer from channel noise to some de-

gree, and all wireless microphone systems seek to mini-

mize the impact of that noise on the desired signal. Con-

ventional analog systems use compandors for enhanced

dynamic range, at the cost of subtle artifacts (known as

“pumping” and “breathing”). Wholly digital systems defeat

the noise by sending the audio information in digital form,

at the cost of some combination of power, bandwidth and

resistance to interference.US Patent 7,225,135

Lectrosonics Digital Hybrid Wireless™ systems over-

come channel noise in a dramatically new way, digitally

encoding the audio in the transmitter and decoding it

in the receiver, yet still sending the encoded informa-

tion via an analog FM wireless link. This proprietary

algorithm is not a digital implementation of an analog

compandor but a technique that can be accomplished

only in the digital domain, even though the inputs and

outputs are analog.

Channel noise still impacts received signal quality and

will eventually overwhelm a receiver. Digital Hybrid

Wireless™ simply encodes the signal to use a noisy

channel as efﬁciently and robustly as possible, yield-

ing audio performance that rivals that of wholly digital

systems, without the power and bandwidth problems

inherent in digital transmission.

Because it uses an analog FM link, Digital Hybrid Wire-

less™ enjoys all the beneﬁts of conventional FM wire-

less systems, such as excellent range, efﬁcient use of

RF spectrum, and resistance to interference. However,

unlike conventional FM systems, it does away with the

analog compandor and its artifacts.

No Pre-Emphasis/De-Emphasis

The Digital Hybrid Wireless™ design results in a signal-to-

noise ratio high enough to preclude the need for conven-

tional pre-emphasis (HF boost) in the transmitter and de-

emphasis (HF roll off) in the receiver. This eliminates the

potential for extreme distortion on signals with abundant

high-frequency information.

LECTROSONICS, INC.

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